Kenmore 721.626424 Microwave Oven User Manual
Contents
1. Jo eouejsiseJ a nseoyN LS QIUE SISAI joej1uoo 1064100 sjequinu 1094100 seop Aejdsiq g W3180Hd eoueisiseJ EUJON pJeoq E Suonoeuuoo JO9LIODUI LNO uid pue uid a nseoyy ozi 0 7 eoe dey 1IVISONHIHL ALIAVO N3AO 81 2 uo ISNA HOS SIUNAFIOHA 9es SSNs 2 Niddns L peuo Japno oyu 51 p109 Ajddns jewod ueuw mopum ul seop JO INIL 135 5 V I3 1HOHd d SUe qod 32208 A MY Q dN ISH On MU AVTASIO 1 9 uo NOLLVH34O IVIUL pees siu 0 SNILOOHS 2 7 21 uonsu eyy sung 1 1 Y 91 4 0660 ees I GAH OAH 40 Ay nunuoo sung JeuuoN 99e doy 40949 1 C AFTER ERS Q N 9 f ees eoueisise1 eui 499 Ss j u 09952. WIRE COLORS SYMBOL COLOR WH WHITE BK BLACK RD RED YL YELLOW PK PINK BL BLUE BR BROWN GN GREEN GY GREY SCHEMATIC DIAGRAM Il check the Model No ADD Noise filter 120 VAC 60Hz Note ONLY 1 DOOR OPENED amp COOK OFF MODE EM i NOISE FILTER ASM E BK ii MICRO COMPUTER BOARD 0 THERMOSTAT OVEN LAMP L V TRANSFORMER BL ro W CONDENSER PK 6 SECONDARY SWITCH TOP TURNTABLE MOTOR BK n N ud NO SWITCH WH MIDDLE CN5 RECTIFIER H V TRANSFORMER PRIMARY SMITEN H V CAPACITOR dg MAGNETRON OPTIONAL FUNCTION FOR SENSOR MODEL ONLY WIRE COLORS CONTROL MODULE SYMBOL COLOR WH WHITE BK BLACK WH RD ERS hL Po WH RD RD RED 1234567 123 YL YELLOW BL BLUE BR BROWN 7 CONNECTOR CN1 3 PIN 3PIN CN5 GN GREEN CONNECTOR CN2 CONNECTOR GY GREY FOR SENSOR 5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX ggg rn DDDDDDD Dinner Plate N C N C 4 BZ Auto Pizza Popcorn Defrost Minute i P Kitchen 5 3 GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE A Never operate the unit when it is empty Operating the oven with no load may shorten the life of the magnetron
3. LE jejsouueuy E Mo 1oejuo2 jyeisouueuy 00 JO au 42949 3504 gt Alddns L peuonoi s ey NV jou Ue 3 INITAOHd 7 24 EV EXPLODED VIEW DOOR PARTS Model 721 62642400 721 80592401 721 80592402 721 62649400 721 80599401 721 80599402 721 62644400 721 80594401 721 80594402 721 62643400 721 80593401 721 80593402 For 721 62643 721 80593 EV CONTROLLER PARTS FOR MODEL 721 62642 721 62649 721 62644 721 80592 721 80599 721 80594 es T_ FOR MODEL 2 _ 7 721 62643 wo 721 80593 a EV OVEN CAVITY PARTS FOR MODEL 721 62642 721 62644 721 80592 M 721 80594 FOR MODEL _ 1721 62649 71 721 62643 21 80599 21 80 8 3 LATCH BOARD PARTS EV INTERIOR PARTS I 8 5 EV Model 721 80592401 721 80599401 721 80594401 721 80593401 INTERIOR PARTS II Check the rating label of Model and order SVC parts according to the Model No
4. Frozen Frozen NC Hold Express Canned Turntable Vegetable Entree Warm Defrost Vegetable A A A VENT VENT LIGHT Dinner Soup or On Off 5 speed Plate sauce NC A A A AA Fresh Auto Auto Add Vegetable Reheat Potato Defrost Minute Pizza Popcorn A AHA vua Auto Kitchen N C Cook N C Timer Clock More Z A A A A e A Cook STOP Power Time Clear START 8 9 0 A AA SSA VA Figure 27 Resistance value When touched When not touched Less than 400 ohms More than 1 mega ohm FPC CONNECTOR Top L_ 4 onn Figure 28 COMPONENTS TEST PROCEDURES RESULTS Check of relay 2 with an ohm meter Remove wire leads from relay 2 and operate the unit RELAY2 Figure 30 a A N A CAUTION The relay connector 2 must be correctly connected Relay 2 o NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES B CHECKOUT PROCEDURES 1 CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION REPLACE BLOWN FUSE WITH
5. MODEL 721 62642 721 80592 721 62649 80599 S IE AA RS 721 62644 721 80594 721 62643 80593 DIVISION 22 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 62642400 721 80592401 721 80592402 721 62649400 721 80599401 721 80599402 721 62644400 721 80594401 721 80594402 721 62643400 721 80593401 721 80593402 March 2005 CAUTION SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Do not operate or allow the oven to be operated with the door open Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 Interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner A Microwave leakage check to verify comp
6. eene eene 5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD eee enne nnne enne enne 5 3 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE nennen nennen enne nennen 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES Henne 6 1 SERVICE INFORMATION rei 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS mmm eee 7 1 MICROWAVE LEAKAGE TEST nennen nennen sen i 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS eene nennen enne eene 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST ener ener enne 7 14 TEST AND CHECKOUT PROCEDURES AND TROUBLE 7 15 TEST PROCEDURES eene nnne enne eene eene nee 7 15 B CHECKOUT PROCEDURES menn 7 18 C TROUBLE SHOOTING enne eene 7 21 EXPLODED VIEW nee 8 1 PART REFERENCE LIST 9 1 SPECIFICATIONS Rated Power Consumption Microwave Output Frequency Power Supply Rated Current Magnetron Cooling Rectification Door Sealing Safety Devices Magnetron High Voltage Capacitor High Voltage Diode Cook top Lamp Cavity Lamp Timer Tray Overall Dimensions Oven Cavity Size Effective Capacity of Oven Cavity Accessories 1500W maximum Microwave oven Cook top lamps Ventilation fan 1000W IEC60705 Adjustable 100W through 1000W 10 steps 2450 MHz 50 MHz 120 VAC 60
7. S Z 9660 ees 109100 Jeuuojsuel AH mi EWON O N H eoeideu ooueljsisoH 10 eouejsiseJ s nseayy NJ AH eaejdeg 4 eoe deg MO 1021009 E LS 1 JO 092 81 4 9080 ees z Buneos E 0108002 eui 2940 suny 1081102 1004 1 ET iL p1eoq 7 22 4IVLSOWHSHL 6 S3HOLIMS X9O TH31NI AHVINOO3S ANY AHVIWIHd 49949 L H3MOd H9IH 40 payono SI 9 LUVIS umop sjunoo ji dn jou 9 NATAOHd uonejedo jeuuou 2245 Bupjooo pue ye Jo usamjag au u ym Burzznq NITAOHd 7 23 ASSY ASSY uonemueA ooe dou suni ON pJeoq JBuu0N sung joejuoo MO 1961002 ees LS 10 2euuoo Jo 0900 1991109 1061000 1004 E
8. Whenever cooking dry foods dried fish bread etc or a small amount of food be sure to put a glass of water into the cooking compartment The glass turntable may become hot after operating be careful when touching it Aluminum foil should be avoided because it will disrupt cooking and may cause arcing However small pieces may be used to cover some parts of food to slow the cooking Any aluminum foil used should never be closer than 2 5 cm to any side wall of the oven TRIAL OPERATION After installation the following sequences and results should be checked carefully A B Put a container filled with water about 1 liter into the oven and close the door tightly Set cooking time for 10 minutes by touching 1 and then 0 three times 1 0 0 0 appears in the display window Touch the START key Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed Continue operating the unit Two short and a long beep sound signal is heard when the time is up The unit will shut off automatically Confirm the water is hot Finally measure the output power according to POWER O
9. 5037 Check the Check the Model No Model No Check the 5001 Model No H Check the PO IN Model No SA m EV INTERIOR PARTS II Model 721 80592402 Check the rating label of Model and order 721 80599402 SVC parts according to the Model No 721 80594402 721 80593402 Check the Check the Model No Model No Check the Model No Check the IN Model No 4 GD EV INSTALLATION PARTS P NO 3828W5S5158 Printed in Korea
10. CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacture importer or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW cm and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance If the oven operates with the door open the service personnel should Tell the user not to operate the oven The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 3 2 in Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 C 68 9 F water in a beaker which is graduated to 600 cc and place the beaker on t
11. Hz 14 Amp Microwave oven Cook top lamp Ventilation fan Forced Air Cooling Rectification Voltage Double Half Wave Choke System Magnetron Thermal Fuse Open at 90 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch 2M214 161GP Capacitor 1 0pF 2 1 KV AC Diode 350mA 9 0 KV 125 V 30 W or 40 W Digital up to 99 mim 99 sec in each cooking stage Tempered Safety Glass 29756 W xX 167 16 H x15 s D 21 16 W x14 e H x8 D 1 6 Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Two Filters Rotating Ring Assembly 1 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair DO NOT operate on a 2 wire extension cord during repair and use NEVER TOUCH any oven components or wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or checking you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver Remove your watches whenever working close to or replacing the Magnetron DO NOT touch any parts of the control panel circuit A resul
12. REMOVE THE FPC CONNECTOR on the next page 6 Remove the circuit board from the control bracket carefully Control Bracket FPC Connector S1 Circuit Board HOW TO REMOVE THE F P C CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F P C connector 1 Hold the edges of the plastic fastener with thumb and forefinger Figure 4 2 Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger Figure 5 3 Remove the F P C connector from the terminal socket Plastic fastener F P C Connector Terminal socket Figure 4 Plastic fastener Connector Terminal socket Figure 5 HOW TO INSERT THE F P C CONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook of the terminal socket securely by releasing the fingers Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Connector Terminal sock
13. TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING CAUTIONS Filament Winding DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER SEE FIGURE 24 Secondary Winding ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN A TEST PROCEDURES COMPONENTS TEST PROCEDURES primary Winding Figure 24 RESULTS MAGNETRON Wire leads are removed 1 Measure the resistance Across the filament terminals of the magnetron with an ohm meter on Rx1 scale 2 Measure the resistance Between each filament terminal of the magnetron and the chassis ground with an ohm meter on high test scale Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Replace the magnetron if the magnetron checks and all of the high voltage component tests are good but the unit still does not heat a load HIGH VOLTAGE TRANSFORMER Wire leads are removed 1 Measure the resistance With an ohm meter on Rx1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to grou
14. a location where there is direct heat or splashing water C Install the unit on the mounting plate firmly D Place the unit as far away as possible from TV radio etc to prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be grounded automatically Plug with Ground Prong Properly Polarized and Grounded Outlet WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third ground prong from the power cord plug 3 1 OPERATING INSTRUCTIONS CONTROL PANEL y 20 0 35 24 Si ec gt x o Te a inner ate ntree 55 auc EA MN vem egeta etable egetable inb albo a 9207 lt lt S 5 E n E S 2 9 5 CONTROL PANEL INSTRUCTIONS 1 Display The display includes a clock and indicators to tell you time of day cooking time settings cook powers quantities weights and cooking functions selected 2 Dinner Plate Touch this pad to cook without entering a cook time or
15. ventilation motor ASS Y out of 1 When mounting the door assembly to the oven the microwave oven See Figure 18 assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven Space M 1 t Figure 8 H REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 17 Mount All Figure 17 I REMOVING THE TURNTABLE MOTOR 1 Remove the turntable 2 Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver Figure 19 3 Remove the base plate by removing eight screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove a screw securing the turntable motor to the oven cavity ASS Y Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 19 Figure 20 Wire Leads 1 Turntable Motor Figure 21 INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which h
16. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Express Defrost Touch this pad to express defrost GROUND BEEF 1 0 LBS TOUCH START will appear in the display Add Minute Touch this pad to cook for 1 minute at 10096 cook power or to add extra minutes at the set cook power to your cooking cycle More Touch this pad to add 10 seconds of cook time each time you press it Cook Time Touch this pad followed by Number Pads to set a cooking time Power Touch this pad after the cook time has been set followed by a Number Pad to set the amount of microwave energy released to cook the food The higher the number the higher the microwave power or cooking speed Less Touch this pad to subtract 10 seconds of cook time each time you press it Kitchen Timer Touch this pad to set the kitchen timer START Touch this pad to start a function If you open the door after the oven begins to cook retouch START STOP Clear Touch this pad to erase an incorrect command cancel a program during cooking or to clear the Display Clock Touch this pad to enter the correct time of day Turntable On Off Touch this pad to turn off the turntable T TABLE OFF will appear in the display Fan amp On Off Touch this pad to turn the fan on or off Fan amp 5 Speed Touch this pad to choose one of 5 fan speeds Light Touch this pad to turn the light on high night o
17. 20 AMPERE FUSE PROBLEMS CAUSES Fuse blows immediately after the door is closed Improper operation of the primary interlock secondary Fuse blows immediately after interlock switches and or the interlock monitor switch the door is opened Fuse blows when the door is closed and START Malfunction of the high voltage transformer the high key is touched voltage capacitor including the diode the magnetron the blower motor or the circuit board NOTES f the fuse is blown by an improper switch operation replace all switches and the fuse at the same time After replacing the defective switches with new ones make sure that they are correctly connected Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM Oven lamp turn on without touching START key when the door is closed Remove the mate connector of I O D a CON from the circuit board Does the unit still operate be Replace the circuit board Defective RELAY1 Replace RELAY1 PROBLEM B Oven lamp turn on When the door is closed and START key is touched IS In GOOD 7 19 Measure the voltage at pin NO 35 of 001 Voltage readin
18. E To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 8 Loosen the two screws holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board upward toward the top of the oven and or away from the door latch until the gaps are less than 1 64 0 5 mm Hold the latch board tightly in this position until you check the sequence of the switches in steps 5 and 6 TEST THE LATCH AND SWITCH SEQUENCE b Open the oven door slowly Watch the door latch 7 When you achieve the proper sequence of the Secondary Switch Release Rod and Lever switches in Steps 5 and 6 tighten the latch board on the switches to make sure they are zero to the screws at that point body of the switches in the following sequence TEST THE MICROWAVE ENERGY LEAKAGE Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Make sure the microwave energy leakage is below the limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the Adjust the latch board until the switches operate in cabinet when measured with a survey meter this sequence See Steps 3 and 4 6 Close the oven door slowly and be sure it is tightly cl
19. POWER OUTPUT MEASUREMENT 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 3 mm and an outside diameter of approximately 7 6 190mm 3 The oven and the empty vessel are at ambient Temperature TO prior to the start of the test 4 The initial temperature T1 of the water is 10 1 C 50 F It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the turntable which is in the lowest position and the microwave power switched on 5 The time T for the temperature of the water to rise by a value AT of 10 1 K is measured where T is the time in seconds and AT is the temperature rise The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 K 6 The microwave power output P in watts is calculated from the following formula NOTE WHEN MEASURING 1 Do not exceed meter full scale deflection 2 The test probe must be removed no faster than 1 inch sec 2 5cm sec along the shaded area otherwise a false reading may result 3 The test probe must be held with the grip port
20. UTPUT MEASUREMENT on page 7 3 6 1 FEATURES AND SPECIFICATIONS FEATURES A The safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch 3 Interlock monitor switch 4 Choke system 5 Magnetron thermostat 6 Oven cavity thermostat Note This thermostat located on the oven cavity will open and stop the unit from operation only if a high temperature is reached such as a fire created by overcooking food B Any one of 10 power output levels ranging 100W to 1000W can be selected by the touch control and electronic computer system SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY A SINCE NEARLY 2 100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE The filament leads of magnetron carry High Voltage with respect to ground Extreme caution must be exercised Never plug the unit into a power source to determine which component is defective in high voltage section TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING 1 Before the power is applied a Make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several by opening and closing the door several times b Make sure the perforated screen and the dielectric choke of the door are co
21. as been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage adjust the door latches and interlock switches using the following procedure The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy The terminals between COM and NC of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected Mounting of the primary monitor secondary switches to the latch board T Latch Board Y Secondary Interlock Switch Interlock Monitor Switch Prima Interlock Switch Figure 22 LATCH 0 1 64 Figure 23 LATCH BOARD 0 1 64 CHECK THE DOOR LATCH AND SWITCH CLOSING NOTE The outer cover of the microwave oven is removed 1 Setthe microwave oven on its side so that you can see the latch board and the switches as shown in Figure 22 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 23 for close up view of gaps A and B door latches If all gaps are less than 1 64 0 5 mm adjustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOT
22. ate a open circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the Switch The meter should indicate closed circuit in the door open condition When the door is closed meter should indicate an open circuit When the monitor switch operation is abnormal replace with the same type of switch NOTE After repairing the door or the interlock system it is necessary to do this continuity test before operating the oven COMPONENTS TEST PROCEDURE RESULTS SWITCHES Check for continuity of the Wire leads removed switch with an Ohm meter Door open Primary Switch i Monitor Switch Secondary Switch connected correctly NOTE After checking for the continuity of switches make sure that they are WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q FOR PRIMARY SWITCH TYPE NO SZM V16 FA 62 OR VP 532A OF OR V 5220Q FOR MONITOR SWITCH TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q FOR SECONDARY SWITCH
23. et Figure 7 B REMOVING THE OUT CASE Figure 8 1 Remove the vent grille by removing two screws securing it to the out case 2 Remove two screws securing it to the front bracket 3 Remove two screws securing it to the air duct 4 Remove the mounting plate by turning the two Screws securing it to the out case b Remove the base plate by removing four screws securing it to the out case Remove the Mount All from the out case by removing two screws securing it to the out case 6 Remove four screws from the rear section 7 Remove the outcase with pushing it back Vent Grille 7 Mount All mu Mounting Out Case Controller Figure 8 C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9 10 1 Disconnect the wire leads from the interlock switches 2 Remove two screws securing the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURE on page 7 12 Latch Board Figure 9 7 7 NIS t Latch Board Secondary Interlock Switch Interlock us 59 Monitor Switch Primary Interlock Switch Figure 10 WIRE COLOR SYMBOL COLOR WH WHITE BK BLACK BR RD YL PK BL GY GN GREEN D 1 2 3 4 5 REMOVING MAGNETRON Figures 11 Through 13 Remove the vent grille Remove mount all Remove outcase Disconnect the wireleads Remove
24. g 5 Vdc p Defective Replace the RELAY1 or poor circuit board connection of RELAY1 Replace RELAY1 or correct the connection 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board 1 The start function fails to operate but the high voltage Systems the interlock switches the door sensing and the relay check good The unit with a normal relay continuously operates Proper temperature measurement is not obtained The buzzer does not sound or continues to sound Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 2 3 4 5 Wrong figures appear The figures of all digits Some of the indicators do no flicker light up 6 7 8 9 The clock does not keep time properly NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 20 sung joejuoo joe1uoo 1991109 400d p1eoq xo joe1u02 LE 10911000 oouejsisoH 21 2 pue ees LS 40 99UUOI Jaye
25. he center of the turntable Set the energy leakage monitor to 2 450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use the 2 inch bcm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured Move probe along shaded area Probe scanning speed Less than 2 5 cm sec 1 in sec MEASUREMENT WITH THE OUTER CASE REMOVED 1 When you replace the magnetron measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring the following parts Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS MEASUREMENT WITH A FULLY ASSEMBLED OVEN 1 After all components including the outer panels are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings 2 Microwave energy leakage must not exceed the values prescribed below NOTES Leakage with the outer panels removed less than 5 mW cm Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 2 mW cm
26. ion of the handle A false reading may result if the operator s hand is between the handle and the probe 4 When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface this may possibly cause probe damage RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 1 After adjustment and repair of any microwave energy interruption or microwave energy blocking device record the measured values for future reference Also enter the information on the service invoice 2 Should the microwave energy leakage not be more than 2 mW cm after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 4187 Mw T2 T1 0 55Mc T2 TO T is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 3 sec 7 The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature 8 Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat Where P is the microwave power output in watts Mw is the mass of the water in grams Mc is the mass of the container in grams TO is the ambient tempe
27. liance with the Federal performance standard should be performed on each oven prior to release to the owner Proper operation of the microwave ovens requires that the magnetron be assembled to the wave guide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Routine service safety procedures should be exercised at all times Untrained personnel should not attempt service without a thorough review of the test procedures and safety information contained in this manual FOREWORD Read this Manual carefully Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity MODEL 721 62642 721 80592 721 62649 721 80599 721 62644 721 80594 721 62643 721 80593 TABLE OF CONTENTS Page SAFETY PRECAUTIONS iii Inside front page SPECIFICATIONS 1 1 2 1 INSTALLATIONS ieri 3 1 OPERATING INSTRUCTIONS enean nnne nasse nennen enne nne 4 1 CONTROL PANEL M 4 1 CONTROL PANEL INSTRUCTIONS eene enne nennen sera 4 2 OVERALL CIRCUIT DIAGRAM eene enne ense nnne nennen senten ness eene nnne 5 1 SCHEMATIC DIAGRAM l nennen nnne nnne nennen nnne nentes enne 5 1 SCHEMATIC DIAGRAM ll nnne nennen
28. nd b Filament winding to ground Normal readings Approx 0 3 to 0 5 ohm Less than 0 1 ohm Approx 65 to 120 ohms Normal readings Infinite ohms Infinite ohms NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 15 COMPONENTS TEST PROCEDURES RESULTS HIGH VOLTAGE CAPACITOR Measure the resistance 1 Terminal to terminal Figure 25 a Normal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning 2 Terminal to case Figure 25 b Normal readings Infinite Abnormal reading Indicates continuity HIGH VOLTAGE DIODE Measure the continuity 1 Forward Figure 26 b Normal readings continuity Abnormal reading Infinite 1 Reverse Normal readings Infinite Abnormal reading continuity COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY BOARD Measure the resistance between terminal pins of connector KEY CONNECTOR NOTE When reconnecting the FPC connector make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix circuit of each model refer to page 5 2 1 2 3 4 7 1 2 3 4 5 6 7 A A A A A A A
29. osed Watch the three switches to make sure they are zero to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click should be heard at the same time or successively at intervals and the latches should activate the switches with an audible click If the latches do not activate the switches when the door is closed the switches should be a adjusted in accordance with the adjustment procedure Disconnect the wire lead from the primary switch Connect the ohmmeter leads to the common COM and normally open NO terminal of the Switch The meter should indicate an open circuit in the door open condition When the door is closed the meter should indicate a closed circuit When the primary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary Switch Connect the ohmmeter leads to the common COM and normally open NO terminals of the Switch The meter should indic
30. power 3 Frozen Entree Touch this pad to cook a 10 to 20 ounce 284 to 567 g frozen entree without entering a cook time or power 4 Potato Touch this pad to cook potatoes without entering a cook time or power 5 Soup or Sauce Touch this pad to cook without entering a cook time or power 6 Frozen Vegetable Touch this pad to cook without entering a cook time or power 7 Fresh Vegetable Touch this pad to cook without entering cook times or powers 8 Canned Vegetable Touch this pad to cook without entering a cook time or power 9 Popcorn Touch this pad to pop popcorn with the sensor feature The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects from the popcorn 10 Pizza Touch this pad to reheat one or several slices of pizza without entering cook times or powers 11 Auto Cook Touch this pad to cook microwavable foods without entering cook times or powers 12 Auto Reheat Touch this pad to reheat microwavable foods without entering cook times or powers 13 Hold Warm Touch this pad to keep hot cooked foods safely warm in your oven for up to 99 minutes 99 seconds Hold Warm can be used by itself or it can automatically follow a cooking cycle 14 Auto Defrost Touch this pad followed by Number Pads to thaw frozen meat by weight 15 Number Pads Touch number pads to enter cooking times cook powers quantities weights or food categories 4 2
31. r off NOTE If you try to enter incorrect instructions you will not hear any tones Touch STOP Clear and re enter the instructions OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM check the Model Note 1 DOOR OPENED amp COOK OFF MODE 120 VAC 60Hz SINGLE PHASE OVEN THERMOSTAT de NO WH GND ONLY FUSE GND BK also BK 2 MICRO COMPUTER BOARD VENT MOTOR 3 n 3E OVEN LAMP LV TRANSFORMER RYI on RYI4 i 5 cA 92 BL WH CQOKTOP cup RYH VM HI Ts 1 BL WH PK SECONDARY RY6 4 4 OP TM i 313 212 11 cY TURNTABLE NTABLI YL MOTOR YL OL WH ABSOLUTE RY2 NC HUMIDITY MONITOR SENSOR MIDDLE 2 00000000000000 O 1 2 3 THEMISTORI ua rl WA H V TRANSFORMER NO RECTIFIER STORME PRIMARY SWITCH H V CAPACITOR BOTTOM MAGNETRON OPTIONAL FUNCTION FOR SENSOR MODEL ONLY CONTROL MODULE WH RD BK GY BR BL GN YL LT 12345 67 12 3 7 PIN CONNECTOR CN1 3 PIN CONNECTOR CN2 WH RD BK 3PIN CN5 CONNECTOR FOR SENSOR 5 1
32. rature in jC is the initial temperature of the water C T2 is the final temperature of the water in jC tis the heating time in seconds excluding the magnetron filament heat up time WATER LOAD TURNTABLE DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WAIT AT LEAST ONE MINUTE UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE I E TEST PROBE CONNECTED TO 10K OHM RESISTOR IN SERIES TO GROUND WHEN RECONNECTING THE WIRE LEADS TO ANY PART MAKE SURE THE WIRING CONNE CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR CUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 8 Remove the connectors CN1 and wire leads Relay2 from the circuit board Control Panel Power Transformer Relay 2 5 Relay 2 CN1 Figure 1 7 4 4 Remove 3 screws securing the circuit board e Figure 2 b Remove the FPC connector from the terminal socket following HOW TO
33. rrectly and firmly mounted 2 After power is applied a Make sure the interlock switch mechanism is operating properly by opening and closing the door b Check microwave energy leakage must bebelow the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings 7 1 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave energy leakage NOTE Always keep the seal clean e Make sure that there are no defective parts in the interlock mechanism f Make sure that there are no detective parts in the microwave generating and transmission assembly especially waveguide 4 The following items should be checked after the unit is repaired a The interlock monitor switch is connected correctly and firmly b The magnetron gasket is properly positioned and mounted c The waveguide and the oven cavity are intact no microwave energy leakage d The door can be properly closed and the safety switches work properly e The unit must stop when the door is opened or the time is up The unit must not be operated with any of the above components removed or by passed MICROWAVE LEAKAGE TEST
34. the three screws and Magnetron very carefully Mount All NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave energy leakage with a survey meter Check microwave energy leakage must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings 1 Outcase Figure 12 Figure 13 E REMOVING DOOR Figure 14 1 Remove the vent grille by two screws securing it to the outcase loosening 2 Lift up and draw the door NOTES After replacing the door be sure to check that the primary interlock switch the secondary interlock switch and the interlock monitor switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm With a 275 ml water load Figure 14 F DISASSEMBLING DOOR Figure 15 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver Door Screen Figure 15 7 9 G ASSEMBLING DOOR 3 Carefully pull the
35. ting static electric discharge may damage this P C B NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on the magnetron NEVER put anything into the latch hole and the interlock switches area MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection All input and output microwave connections waveguide flange and gasket must be secure never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA Gasket COOLING FIN FILAMENT TERMINALS MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V AC 60Hz single phase power source with a capacity of 15A or 20A B Avoid placing the unit in
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